As I was typing my reply the brash I was thinking along the same lines , rpvee. I know a few have mentioned this, but I doubted I'd be able to pull it off.

Ill be watching the scene of Anakin talking to padme before he heads out to Mustafar. Maybe a "hold this for me until I return" shot of him handing her the saber can be worked out.

If it can be done, Ill move onto Obi talking to Padme looking for a good way to have Obi get ahold of it. Maybe she has it in here lap and she's thinking about Anakin toward the end of that scene. After Obi cuts out she looks down again, and the saber is gone. Obi (the sneaky) wan